foreach (DataRow dr in ds.Tables[0].Rows)
        {
            TableRow riga = new TableRow();
            TableCell cella1 = new TableCell();
            TableCell cella2 = new TableCell();
            CheckBox check = new CheckBox();
            cella1.Text = dr["immagine"].ToString();
            cella1.CssClass = "testiScheda";
            riga.Controls.Add(cella1);
            check.ID = "check" + dr["ID_foto"].ToString();
            cella2.Controls.Add(check);
            cella2.CssClass = "testiScheda";
            riga.Controls.Add(cella2);
            tbl.Controls.AddAt(7, riga);            
        }